Valve needle assembly and electronic expansion valve with same

Abstract

The utility model provides a valve needle assembly and an electronic expansion valve with the valve needle assembly, the valve needle assembly comprises a valve head, the valve head is provided with a flow adjusting part, the flow adjusting part is used for adjusting the flow at a valve port, and the side wall of one side, close to the flow adjusting part, of the valve head is annularly provided with a mounting groove; the sealing gasket is arranged in the mounting groove, the sealing gasket is in sealing fit with the inner wall of the mounting groove, an avoiding part is arranged on the inner wall of the sealing gasket, a mounting space is defined by the avoiding part and the mounting groove, a sealing ring is arranged in the mounting space, the sealing ring is in sealing fit with the avoiding part and the mounting groove, and a communicating channel is further formed in the sealing gasket; one end of the communication channel communicates with the installation space, and the other end of the communication channel communicates with the outside. According to the technical scheme, the problem that in the prior art, the matching position of a sealing gasket and a sealing ring is prone to deformation due to cold and heat can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic expansion valve technical field, specifically, a valve needle subassembly and electronic expansion valve with it are provided. BACKGROUND

[0002] At present, in the electronic expansion valve, the valve needle is movably arranged corresponding to the valve port to adjust the flow at the valve port, and a soft sealing gasket is usually arranged at the valve head of the valve needle to reduce the internal leakage of the electronic expansion valve.

[0003] In the related art, a mounting groove is usually arranged on the valve head, and the sealing gasket sleeve is arranged in the sealing groove. When the low-temperature refrigerant flows through the valve port, the material of the soft sealing gasket will shrink after being cooled, resulting in a gap between the sealing gasket and the mounting groove. The refrigerant at the valve port may enter the gap between the mounting groove and the sealing gasket, and leak from the gap. Therefore, the related art further arranges a sealing ring between the mounting groove and the sealing gasket to realize the sealing of the mounting groove and the sealing gasket. Since the sealing gasket shrinks after being cooled to generate a gap, the refrigerant may enter the mounting position of the sealing ring through the gap. When the high-temperature refrigerant flows through the electronic expansion valve, the sealing gasket will also recover to its original state as the temperature rises. The mounting position of the sealing ring will form a sealed space. The refrigerant in the sealed space will expand after being heated, and the refrigerant that has entered the mounting position from the gap between the sealing gasket and the mounting groove will vaporize to generate a large pressure, causing the sealing gasket to deform and affecting the sealing effect of the sealing gasket. SUMMARY

[0004] The utility model provides a valve needle subassembly and electronic expansion valve with it to solve the problem that the cooperation part of the sealing gasket and the sealing ring is easily deformed by cold and heat in the prior art.

[0005] According to one aspect of the utility model, a valve needle subassembly is provided, which includes: a valve head having a flow adjusting part for adjusting the flow at the valve port, and a mounting groove arranged annularly on the side wall of the side of the valve head close to the flow adjusting part; a sealing gasket arranged in the mounting groove and sealingly fitted with the inner wall of the mounting groove, an avoiding part arranged on the inner wall of the sealing gasket, the avoiding part and the mounting groove forming a mounting space, a sealing ring arranged in the mounting space, the sealing ring being sealingly fitted with the avoiding part and the mounting groove respectively, and a communication channel arranged on the sealing gasket, one end of the communication channel being in communication with the mounting space, and the other end of the communication channel being in communication with the outside.

[0006] Further, the avoiding part is arranged on the inner wall of the sealing gasket, and the sealing ring is in abutment with the bottom wall of the mounting groove and the side wall of one of the mounting grooves arranged opposite in the axial direction.

[0007] Further, the mounting groove has a first sidewall and a second sidewall arranged opposite along the axial direction, the second sidewall is located at a side of the first sidewall close to the flow regulating part, the sealing gasket has an extension section and an avoidance section connected with each other, the avoidance section is located at a side of the extension section close to the first sidewall, the inner diameter of the avoidance section gradually increases along the direction from the second sidewall to the first sidewall, and the avoidance section forms an avoidance part.

[0008] Further, the end face of the avoidance section away from the extension section is provided with a groove, and the groove forms a communication channel.

[0009] Further, the depth of the groove along the axial direction of the sealing gasket is less than 0.5 times the diameter of the sealing ring.

[0010] Further, the groove is provided with a plurality of grooves arranged annularly and spaced apart on the end face of the sealing gasket.

[0011] Further, the valve head comprises a body and a connecting sleeve, the body has a mounting section and a regulating section connected with each other, the diameter of the mounting section is less than the diameter of the regulating section at a side close to the mounting section, the end of the regulating section away from the mounting section forms a flow regulating part, the connecting sleeve is sleeved on the mounting section, the connecting sleeve and the regulating section are spaced apart along the axial direction, and the space forms a mounting groove.

[0012] Further, along the axial direction, the distance from the end face of the mounting section away from the regulating section to the regulating section is greater than the distance from the end face of the connecting sleeve away from the regulating section to the regulating section.

[0013] Further, the connecting sleeve and the sidewall of the mounting section are fixed by laser welding.

[0014] Further, the outer diameter of the sealing gasket at a side close to the flow regulating part gradually increases along the direction away from the flow regulating part.

[0015] According to another aspect of the present application, an electronic expansion valve is provided, and the electronic expansion valve has the valve needle assembly.

[0016] The technical scheme is applied to the present application, when low-temperature refrigerant flows through the electronic expansion valve, the sealing gasket shrinks due to cold, which may cause the sealing gasket to shrink as a whole, gaps appear between the sealing gasket and the inner wall of the mounting groove, the refrigerant may migrate through the gaps, and internal leakage of the electronic expansion valve occurs in the full-closed state, the sealing ring can block the possible gaps to double-seal the electronic expansion valve and reduce the risk of internal leakage of the electronic expansion valve. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the present application, serve to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0018] Figure 1 A structure schematic view of a valve head provided by the present application is shown;

[0019] Figure 2 A structure schematic view of a valve head provided by the present application is shown; Figure 1 An enlarged view of part A in the structure schematic view is shown;

[0020] Figure 3 A structure schematic view of a connecting sleeve and a body provided by the present application is shown;

[0021] Figure 4 A cross-sectional view of a sealing gasket provided by the present application is shown;

[0022] Figure 5 A cross-sectional view of a sealing gasket provided by the present application is shown;

[0023] Figure 6 A cross-sectional view of a sealing gasket provided by the present application is shown;

[0024] Figure 7 A cross-sectional view of a sealing gasket provided by the present application is shown.

[0025] Figure 8 A structure schematic view of an electronic expansion valve provided by the present application is shown.

[0026] The above figures include the following reference numerals:

[0027] 10. Valve head;

[0028] 101. Flow regulation section; 102. Mounting slot; 1021. First side wall; 1022. Second side wall;

[0029] 11. Main body; 111. Installation section; 112. Adjustment section;

[0030] 12. Connecting sleeve;

[0031] 20. Sealing gasket;

[0032] 201. Installation space;

[0033] 21. Extension section; 22. Clearance section; 221. Slot; 222. Connecting hole;

[0034] 30. Sealing ring; 31. First sealing surface; 32. Second sealing surface; 33. Third sealing surface;

[0035] 01. Valve port; 02. Flow chamber. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0037] like Figures 1 to 8 As shown, this embodiment of the present invention provides a valve needle assembly, which includes a valve head 10 and a sealing gasket 20. The valve head 10 has a flow regulating part 101 for regulating the flow rate at the valve port 01. An mounting groove 102 is annularly arranged on the side wall of the valve head 10 near the flow regulating part 101. The sealing gasket 20 is disposed within the mounting groove 102 and is sealed to the inner wall of the mounting groove 102. The sealing gasket 20 has a clearance portion, which, together with the mounting groove 102, forms an installation space 201. A sealing ring 30 is disposed within the installation space 201, sealing to both the clearance portion and the mounting groove 102. The sealing gasket 20 also has a connecting channel, one end of which connects to the installation space 201, and the other end connects to the outside.

[0038] The technical scheme of the utility model, when low-temperature refrigerant flows through the electronic expansion valve, the sealing gasket 20 shrinks due to cold, which may cause the sealing gasket 20 to shrink as a whole, resulting in a gap between the sealing gasket 20 and the inner wall of the mounting groove 102, and the refrigerant may migrate through the gap, causing internal leakage of the electronic expansion valve in the fully closed state. By providing the sealing ring 30, the gap that may occur can be blocked, thereby providing double sealing for the electronic expansion valve and reducing the risk of internal leakage of the electronic expansion valve. However, when the refrigerant enters the mounting space 201 as the sealing gasket 20 shrinks, the gap between the sealing gasket 20 and the mounting groove 102 disappears when the sealing gasket 20 expands due to heat, and the mounting space 201 forms a sealed space. At this time, the communication channel provided on the sealing gasket 20 can communicate the mounting space 201 with the outside, and when the refrigerant in the mounting space 201 continues to expand due to heat, it can flow to the outside through the communication channel, preventing the sealing gasket 20 from deforming due to the expansion of the refrigerant in the mounting space 201, thereby ensuring the structural stability and mounting stability of the sealing gasket 20, ensuring the sealing effect of the valve needle assembly, and improving the stability of the electronic expansion valve in use.

[0039] In the present application, the groove formed by the mounting groove 102 has a bottom wall and first and second side walls 1021 and 1022 arranged opposite to each other in the axial direction, the bottom wall of the mounting groove 102 is annularly arranged, and the first and second side walls 1021 and 1022 are arranged opposite to each other on both sides of the bottom wall in the axial direction of the valve head 10, and the second side wall 1022 is located on the side of the first side wall 1021 close to the flow regulating portion 101.

[0040] Specifically, the avoidance portion is provided on the inner wall of the sealing gasket 20, and the sealing ring 30 abuts against the bottom wall of the mounting groove 102 and one of the side walls of the mounting groove 102 arranged opposite to each other in the axial direction to form a sealing fit with the mounting groove 102. In this way, the sealing ring 30 and the mounting groove 102 can form two sealing surfaces when they are fitted, thereby improving the sealing effect of the sealing fit between the sealing ring 30 and the mounting groove 102.

[0041] In a specific embodiment of the present application, the sealing gasket 20 has an extension section 21 and an avoidance section 22 connected to each other, the avoidance section 22 is located on the side of the extension section 21 close to the first side wall 1021, and the inner diameter of the avoidance section 22 gradually increases in the direction from the second side wall 1022 to the first side wall 1021, and the avoidance section 22 forms the avoidance portion. Through the above arrangement, the inner wall of the avoidance section 22 can be spaced apart from the mounting groove 102 in the axial and radial directions to accommodate the sealing ring 30, and the sealing ring 30 can be kept sealed with the sealing gasket 20.

[0042] Specifically, in the present application, the sealing ring 30 is in sealing cooperation with the side wall of the one of the avoidance portion and the mounting groove 102 arranged axially opposite to each other and the bottom wall of the mounting groove 102, that is, the sealing ring 30 abuts against the side wall of the one of the avoidance portion and the mounting groove 102 arranged axially opposite to each other and the bottom wall of the mounting groove 102, and a certain elastic deformation of the sealing ring 30 forms a sealing surface, please refer to Figures 1 to 3 As shown in the figures, the sealing ring 30 cooperates with the avoidance portion to form a first sealing surface 31, the sealing ring 30 cooperates with the side wall of the one of the mounting groove 102 arranged axially opposite to each other to form a second sealing surface 32, and the sealing ring 30 cooperates with the bottom wall of the mounting groove 102 to form a third sealing surface 33. When the gasket 20 shrinks in the radial and axial directions due to cooling, the sealing ring 30 can maintain the first sealing surface 31, the second sealing surface 32 and the third sealing surface 33 under its own elasticity to seal the gap that may occur.

[0043] Specifically, the inner surface of the avoidance section 22 can be a plane or an arc surface.

[0044] In other embodiments of the present application, the avoidance section 22 can also be located on the side of the extension section 21 close to the second side wall 1022, and the inner diameter of the avoidance section 22 gradually decreases in the direction from the second side wall 1022 to the first side wall 1021, and the avoidance section 22 forms the avoidance portion.

[0045] In the first embodiment of the present application, please refer to Figure 4 and Figure 5 As shown in the figures, the end face of the avoidance section 22 away from the extension section 21 is provided with a slot 221, and the slot 221 forms a communication channel. Through the above arrangement, the slot 221 can communicate the mounting space 201 to guide the refrigerant in the mounting space 201 to the outside.

[0046] Specifically, the depth of the slot 221 in the axial direction of the gasket 20 is less than 0.5 times the diameter of the sealing ring 30. When the depth of the slot 221 in the axial direction of the gasket 20 is greater than or equal to 0.5 times the diameter of the sealing ring 30, the depth of the slot may be greater than the height of the sealing ring after being compressed in the axial direction due to the compression of the sealing ring in the axial direction, causing sealing failure and refrigerant leakage. Therefore, by arranging the depth of the slot 221 in the axial direction of the gasket 20 to be less than 0.5 times the diameter of the sealing ring 30, the stability of the sealing ring 30 can be ensured. Alternatively, the depth of the slot 221 in the axial direction of the gasket 20 can be 0.2 times the diameter of the sealing ring 30, 0.3 times the diameter of the sealing ring 30 or 0.4 times the diameter of the sealing ring 30, as long as the communication function can be realized.

[0047] Further, the plurality of grooves 221 are annularly and spacedly arranged on the end face of the sealing gasket 20. Through the above arrangement, the total flow area of the communication passage can be increased by increasing the number of grooves 221, the release effect of the communication passage on the refrigerant can be improved, the rapid volume expansion of the refrigerant in the mounting space 201 due to the rapid temperature rise can be prevented, and further, the deformation of the sealing gasket 20 due to the excessive pressure from the mounting space 201 side can be prevented.

[0048] Optionally, the groove 221 can have different cross-sectional shapes, such as triangular, rectangular, or semicircular, according to the machining tool or the forming die.

[0049] In the second embodiment of the present application, as shown in Figure 6 and Figure 7 , the side wall of the avoiding section 22 is provided with a communication hole 222 extending in the radial direction to form a communication passage. Through the above arrangement, the communication hole 222 can communicate with the mounting space 201 to guide the refrigerant in the mounting space 201 to the outside.

[0050] Optionally, the two ports of the communication hole 222 can also have a spacing in the height direction, as long as they do not interfere with the sealing ring 30 and the part of the sealing gasket 20 that is in sealing cooperation with the valve port 01.

[0051] Correspondingly, the communication hole 222 is provided with a plurality of communication holes 222, and the plurality of communication holes 222 are annularly and spacedly arranged on the avoiding section 22 of the sealing gasket 20. Through the above arrangement, the total flow area of the communication passage can be increased by increasing the number of communication holes 222, the release effect of the communication passage on the refrigerant can be improved, the rapid volume expansion of the refrigerant in the mounting space 201 due to the rapid temperature rise can be prevented, and further, the deformation of the sealing gasket 20 due to the excessive pressure from the mounting space 201 side can be prevented.

[0052] Specifically, as shown in Figure 3 , the valve head 10 includes a body 11 and a connecting sleeve 12, the body 11 has a mounting section 111 and an adjusting section 112 connected to each other, the diameter of the mounting section 111 is smaller than the diameter of the adjusting section 112 close to the mounting section 111, the end of the adjusting section 112 away from the mounting section 111 forms a flow adjusting part 101, the connecting sleeve 12 is sleeved on the mounting section 111, the connecting sleeve 12 and the adjusting section 112 have a spacing in the axial direction, and the spacing forms a mounting groove 102. Through the above arrangement, the sealing gasket 20 can enter the predetermined mounting position through the mounting section 111, so as to facilitate the installation of the sealing gasket 20, and the axial position of the connecting sleeve 12 relative to the body 11 can be adjusted to adjust the pressing force of the body 11 on the sealing gasket 20, so as to adjust the pre-tightening force of the body 11 on the sealing gasket 20.

[0053] Specifically, the connecting sleeve 12 and the side wall of the mounting section 111 are fixed by laser welding. In the axial direction, the distance from the end face of the mounting section 111 away from one end of the adjusting section 112 to the adjusting section 112 is greater than the distance from the end face of the connecting sleeve 12 away from one end of the adjusting section 112 to the adjusting section 112. Through the above arrangement, the side wall of the mounting section 111 protruding from the connecting sleeve 12 can provide a processing basis for the fixing structure of the mounting section connecting sleeve 12, that is, the welding position is located at the junction of the mounting section 111 protruding from the connecting sleeve 12, which facilitates laser welding to fix the connecting body 11 and the connecting sleeve 12. Through the above arrangement, the position of laser welding is located at the end away from the adjusting section 112, that is, the end away from the gasket 20, and the heat affected zone of laser welding is smaller, which can reduce the influence of heat on the size of the gasket 20 during welding, and the laser welding precision is higher, which can ensure the welding effect.

[0054] Further, the outer diameter of the gasket 20 near the flow adjusting part 101 gradually increases in the direction away from the flow adjusting part 101. Through the above arrangement, the side wall of the gasket 20 near the flow adjusting part 101 can cooperate with the circumference of the valve port 01, improve the sealing area of the valve port 01, and ensure the sealing effect of the valve needle assembly.

[0055] According to another aspect of the present application, an electronic expansion valve is provided, which has the above-mentioned valve needle assembly.

[0056] Specifically as shown in Figure 8 The electronic expansion valve further includes a valve body having a valve port 01 and a flow passage 02, the flow passage 02 is provided with a flow port on the side wall, the flow port communicates with the valve port 01 through the flow passage 02, the valve needle assembly is movably arranged in the flow passage 02, and the valve head of the valve needle assembly is arranged towards the valve port 01 to adjust the flow of refrigerant fluid at the valve port 01, and the gasket 20 is in sealing cooperation with the valve port 01 when the electronic expansion valve switches to the full-closed mode.

[0057] By applying the valve needle assembly provided in the present application to the electronic expansion valve, the installation space 201 and the outside can be communicated through the communication channel provided on the gasket 20, and when the refrigerant in the installation space 201 is heated and expanded, it can flow to the outside through the communication channel, preventing the gasket 20 from being deformed by the pressure on the side of the installation space 201, thereby ensuring the structural stability and installation stability of the gasket 20 itself, ensuring the sealing effect of the valve needle assembly, and improving the stability of the electronic expansion valve.

[0058] Specifically, the outside mentioned in the present application is the flow passage 02.

[0059] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0060] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments are not intended to limit the scope of the present application unless otherwise specifically stated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportion relationship for the convenience of description. The technology, methods and devices known to those skilled in the related art can not be discussed in detail, but should be considered as part of the specification under appropriate circumstances. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so further discussion is not needed in subsequent drawings once an item is defined in one drawing.

[0061] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0062] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Well, the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0063] In addition, it should be noted that the use of "first", "second", and the like words of distinction do not have a special meaning, and are only used to distinguish the corresponding parts, and therefore cannot be understood as limiting the protection scope of the utility model.

[0064] The preferred embodiments of the utility model are described above, and the utility model is not limited to the above. The utility model can be changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A valve needle assembly, characterized in that The valve needle assembly comprises: A valve head (10) having a flow regulating portion (101) for regulating flow at a valve port (01), the valve head (10) being annularly provided with a mounting groove (102) on a side wall of a side of the flow regulating portion (101) close to the flow regulating portion (101); A sealing gasket (20) provided in the mounting groove (102) and in sealing engagement with an inner wall of the mounting groove (102), the sealing gasket (20) being provided with a relief portion, the relief portion and the mounting groove (102) forming a mounting space (201), a sealing ring (30) being provided in the mounting space (201), the sealing ring (30) being in sealing engagement with the relief portion and the mounting groove (102) respectively, the sealing gasket (20) being further provided with a communication passage, one end of the communication passage being in communication with the mounting space (201), the other end of the communication passage being in communication with the outside.

2. The valve needle assembly of claim 1, wherein The relief portion is provided on an inner wall of the sealing gasket (20), and the sealing ring (30) is in abutment with a bottom wall of the mounting groove (102) and a side wall of the mounting groove (102) opposite to the side wall in the axial direction respectively.

3. The valve needle assembly of claim 2, wherein, The mounting groove (102) has a first side wall (1021) and a second side wall (1022) opposite to each other in the axial direction, the second side wall (1022) being located on a side of the first side wall (1021) close to the flow regulating portion (101), the sealing gasket (20) has an extension segment (21) and a relief segment (22) connected to each other, the relief segment (22) being located on a side of the extension segment (21) close to the first side wall (1021), the inner diameter of the relief segment (22) gradually increasing in a direction from the second side wall (1022) to the first side wall (1021), and the relief segment (22) forming the relief portion.

4. The valve needle assembly of claim 3, wherein The relief segment (22) is provided with a groove (221) on an end face of a side of the relief segment (22) away from the extension segment (21), and the groove (221) forms the communication passage.

5. The valve needle assembly of claim 4, wherein, The depth of the groove (221) in the axial direction of the sealing gasket (20) is less than 0.5 times the diameter of the sealing ring (30).

6. The valve needle assembly of claim 4, wherein The groove (221) is provided with a plurality of groove (221) annularly and spacedly provided on the end face of the sealing gasket (20).

7. The valve needle assembly of claim 1, wherein The valve head (10) comprises a body (11) and a connecting sleeve (12), the body (11) having a mounting segment (111) and a regulating segment (112) connected to each other, the diameter of the mounting segment (111) being less than the diameter of an end of the regulating segment (112) close to the mounting segment (111), an end of the regulating segment (112) away from the mounting segment (111) forming the flow regulating portion (101), the connecting sleeve (12) being sleeved on the mounting segment (111), the connecting sleeve (12) and the regulating segment (112) being spaced in the axial direction, and the space forming the mounting groove (102).

8. The valve needle assembly of claim 7, wherein, In the axial direction, the distance from the end face of one end of the mounting section (111) away from the regulating section (112) to the regulating section (112) is greater than the distance from the end face of one end of the connecting sleeve (12) away from the regulating section (112) to the regulating section (112).

9. The valve needle assembly of claim 8, wherein, The connecting sleeve (12) and the side wall of the mounting section (111) are fixed by laser welding.

10. The valve needle assembly of claim 1, wherein The outer diameter of the sealing gasket (20) near one side of the flow regulating portion (101) gradually increases in a direction away from the flow regulating portion (101).

11. An electronic expansion valve characterized by The electronic expansion valve has the valve needle assembly according to any one of claims 1 to 10.

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